JP2561197Y2 - Combination of electric welding pipe joint and power supply terminal - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called electric welding pipe joint which is used for electrothermal fusion connection of a thermoplastic resin pipe such as a polyethylene pipe and a polyvinylidene chloride pipe, and a power supply detachably attached thereto. It relates to the combination with the terminal.

[0002]

2. Description of the Related Art Conventionally, a so-called electric welding pipe joint used for fusion-connecting a thermoplastic resin pipe such as a polyethylene pipe and a polyvinylidene chloride pipe is disclosed in, for example, Japanese Patent No. 808356. It is known. Further, in order to supply power to the resistance heating wire disposed on the inner surface of the receiving portion of the electric welding pipe joint, the power supply terminals connected to both ends thereof protrude from the pipe wall of the pipe joint. In addition, since it becomes useless after welding, it can be detachably screwed so that it can be used repeatedly to avoid damage and save resources. Known as described in 130131.

[0003]

Such a power supply terminal for an electric welded pipe joint has a built-in identification resistor, and the power supply terminal for the electric welded pipe joint depends on the inner diameter of the pipe connection portion of the electric welded pipe joint to be attached.
Although the optimal energization time is set, if it is detachable, it is almost impossible to visually identify and select the power supply terminal to be attached to the pipe fitting of a specific inner diameter, and the power supply terminal at the construction site There is a high possibility of misusing. That is, if a specific power supply terminal is attached to a pipe joint having a larger diameter than the pipe joint to be originally attached, there is a possibility that welding failure may occur due to insufficient power supply. When attached to a pipe joint smaller in diameter than the pipe joint, excessive energization may cause deterioration of the resin or lead to a delay in construction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and solves the above-mentioned problems, thereby easily visually recognizing and selecting a power supply terminal to be attached to an electric welding pipe joint having a specific inner diameter. An object of the present invention is to provide a possible combination of an electric welding pipe joint and a power supply terminal.

[0005]

The combination of the electric welding joint and the power supply terminal according to the present invention is based on a combination of a plurality of electric welding pipe joints having different inner diameters of the pipe connection portion and a plurality of kinds of power supply terminals. The outer diameters of the screwed portions of the plurality of types of power supply terminals have different outer diameters depending on the inner diameters of the pipe connection portions of the electric welding pipe joint. The parts are made to be screwable, or the electric connection parts of the plural kinds of power supply terminals are colored in different colors according to the inner diameter of the pipe connection part of the electric welding pipe joint.
The screwing part of the power supply terminal can be screwed to the screwing part of the power supply terminal.
Made is by dolphins, protecting cylinder is provided in the electrical connection of a plurality of types of power supply terminals, it has been made with different outer shape of the protective tube in response to the pipe connection portion inner diameter of the electric welding pipe joint, electrical soluble
The screwed part of the power supply terminal is screwed into the screwed part of the power supply terminal of the fitting.
It comes as made are in dolphin, the corresponding code is printed on the pipe connecting portion inner diameter of the electric welding pipe joint in the outer peripheral wall of the protective tube
The screw of the power supply terminal
The attachment portion is adapted to be screwed .

In the present invention, the power supply terminal is not limited to the case where any one of the above-mentioned claims is selectively applied, and the features of the invention described in a plurality of claims are simultaneously used. Of course, it may be possible.

As a material constituting the power supply terminal of the present invention, a copper alloy such as brass is preferably used. Further, it is preferable that a protective cylinder is formed of a thermoplastic resin on the outer periphery of the electric connection portion of the power supply terminal.

In the present invention, when the electric connection portion of the power supply terminal is colored differently according to the inner diameter of the tube connection portion of the electric welding pipe joint, the electric welding tube to be attached is provided. It is preferable to print a ring of the same color around the entrance of the female screw hole of the joint because the attaching operation can be performed efficiently.

In the present invention, when the outer shape of the protection cylinder of the power supply terminal is made different, specifically, it is made substantially spherical, or a part of the outer diameter of the protection cylinder is enlarged to form a substantially abacus bead. Or a truncated conical shape, or a square shape such as a square, a regular hexagon, or a regular octagon.

In the present invention, the power supply terminal threaded portion of the electric welding pipe joint to which the power supply terminal is to be screwed is connected to both ends of the resistance heating wire and is made of brass or the like having a female screw engraved on the inner surface. A copper alloy cylinder is embedded.

In the present invention, the shape of the electric welding pipe joint to which the power supply terminal is to be screwed is not particularly limited, and is not limited to a full coupling to be described later, a half coupling, an elbow, or the like.
It may be T, cross, Y, or the like. The object to be inserted and welded into the electric welding pipe joint is not limited to a pipe, but may be a cap.

[0012]

As described above, the combination of the electric welding joint and the power supply terminal of the present invention is, as described above, a combination of a plurality of electric welding pipe joints having different inner diameters of the pipe connection portion and a plurality of types of power supply terminals. The outer diameters of the screwed portions of the plurality of types of power supply terminals have different outer diameters in accordance with the inner diameters of the pipe connection portions of the electric welding pipe joint. Or the electrical connection parts of the plural kinds of power supply terminals are colored differently according to the inner diameter of the pipe connection part of the electric welding pipe joint.
The screwing part of the power supply terminal can be screwed to the screwing part of the power terminal.
Has been dolphins, protecting cylinder is provided in the electrical connection of a plurality of types of power supply terminals, have been made with different outer shape of the protective tube in response to the pipe connection portion inner diameter of the electric welding pipe joint, electrical welding
The screwed part of the power supply terminal can be screwed to the screwed part of the power supply terminal of the fitting.
It has been made so that dolphins, code corresponding to the tube connecting portion inner diameter of the electric welding pipe joint in the outer peripheral wall of the protective tube our being printed
The power supply terminal is screwed to the power supply terminal screwing part of the electric welding pipe joint.
Since the portion can be screwed, the power supply terminal to be attached to the pipe joint having a specific inner diameter can be easily visually recognized and selected.

[0013]

Next, the combination of the electric welding joint and the power supply terminal according to the present invention will be further described with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing a use state of the present invention, FIG. 3 is a sectional view showing a second embodiment of the present invention, and FIG. 4 is a third embodiment of the present invention. FIG. 5 is a side view showing a fourth embodiment of the present invention. FIG. 1 (a)
(B) In the first embodiment shown in (c) and (d), FIG.
(A) and (b), A1 and A2 are electro-welded pipe joints, and an inner diameter H1 of a receiving portion 11 which is a pipe connection part of the electro-welded pipe joint A1 shown in FIG. 1 (a) and FIG. Are different from the inner diameter H2 of the receiving portion 12 serving as a pipe connecting portion of the electric welding pipe joint A2. The inner diameter H1 of the receiving portion 11 is 75 mm, and the inner diameter H2 of the receiving portion 12 is 150 mm. Reference numerals 21 and 22 denote power supply terminal screwing portions provided on the pipe walls of the pipe joints A1 and A2, and a brass bottomed cylinder having a female screw engraved on the inner surface thereof is embedded. Reference numerals 31 and 32 denote spiral resistance heating wires embedded in the pipe walls of the pipe joints A1 and A2.
Is electrically connected to In FIGS. 1 (c) and 1 (d), B1 and B2 are power supply terminals, and are disks made of brass.
Above 41 and 42, electrical connection 5 with chamfered tip
1 and 52 are screwed portions 61 and 6 with male screws engraved on the outer periphery below.
2 are integrally extended. On the outer periphery of the electric connection parts 51 and 52, a bottomed cylindrical protective tube that is taller than the electric connection parts 51 and 52
71 and 72 are made of polyacetal by injection molding. The screwing portions 61 and 62 of the power supply terminals B1 and B2 have different outer diameters d1 and d2 according to the inner diameters H1 and H2 of the electric welding pipe joints A1 and A2 to be attached.

The inner diameter D1 of the power supply terminal screwing portions 21 and 21 of the electric welding pipe joint A1 shown in FIG. 1A is the outer diameter d1 of the screwing portion 61 of the power supply terminal B1 shown in FIG. 1C. The screwing portion 61 of the power supply terminal B1 can be screwed and connected into the power supply terminal screwing portion 21. Also, the power supply terminal screwing portion 2 of the electric welding pipe joint A2 shown in FIG.
The inner diameter dimension D2 of each of the power supply terminals B and 2 shown in FIG.
2 has a dimension corresponding to the outer diameter dimension d2 of the threaded portion 62,
The screwing portion 62 of the power supply terminal B2 can be screwed into the power supply terminal screwing portion 22. Please refer to Fig. 2
As shown in FIG. 2A, the screwing portion 61 of the power supply terminal B1 is screwed into the power supply terminal screwing portion 21 of the electric welding pipe joint A1, and as shown in FIG. Threaded part 62
Is screwed into the power supply terminal screwing portion 22 of the electric welding pipe joint A2. Thereafter, by a normal method, a pipe (not shown) is inserted into the pipe connection portions 11 and 12 of the electric welding pipe joints A1 and A2, and the resistance heating wires 31 and 32 are heated by supplying power to the power supply terminals B1 and B2. The pipe walls of the electric welding pipe joints A1 and A2 are melted, and the electric welding pipe joints A1 and A2 and a pipe (not shown) are integrally connected.

In the second embodiment shown in FIGS. 3A and 3B, electric connection portions 51a and 52a of power supply terminals B1a and B2a are provided.
The inner diameters H1, H2 of the pipe connection portions of the electric welding pipe joints A1, A2 shown in FIGS.
The coating films 81 and 82 of different colors are provided according to. That is, the coating 81 of the electric connection portion 51a of the power supply terminal B1a to be attached to the electric welding pipe joint A1 shown in FIG.
The color is different from the coating 82 of the electric connection portion 52a of the power supply terminal B2a to be attached to the electric welding pipe joint A2 shown in (b).

Note that, in the second embodiment shown in FIG. 3, as in the first embodiment shown in FIGS.
The outer diameters d1 and d2 of the threaded portions 61a and 62a of 2a are different from each other, and the inner diameters D1 and D2 of the threaded portions of the electric welding pipe joints A1 and A2 to which the threaded portions 61a and 62a are screwed are outside. Diameter d
1 and d2 may be different from each other.

In the third embodiment shown in FIGS. 4 (a) and 4 (b), the outer shapes of the protection cylinders 61b and 62b of the power supply terminals B1b and B2b are to be attached in FIGS. 1 (a) and 1 (b). Are formed differently according to the inner diameter dimensions H1 and H2 of the pipe connection portions of the electric welding pipe joints A1 and A2 shown in FIG. That is, a power supply terminal B1b to be attached to the electric welding pipe joint A1 shown in FIG.
The shape of the protective cylinder 71b of FIG.
Power supply terminal B to be attached to the electric welding pipe joint A2 shown in FIG.
The shape of the protection cylinder 72b of 2b is substantially spherical.

Incidentally, in the third embodiment shown in FIG. 4, as in the first embodiment shown in FIGS.
The outer diameters d1 and d2 of the threaded portions 61b and 62b of 2b are different from each other, and the inner diameters D1 and D2 of the threaded portions of the electro-welded pipe joints A1 and A2 to which the threaded portions 61b and 62b are screwed. Diameter d
1 and d2 may be different from each other.

Also, in the third embodiment, as in the second embodiment shown in FIG. 3, the coating 81 on the electric connection end 51b of the power supply terminal B1b and the coating on the electric connection end 52b of the power supply terminal B2b. 82 may be colored differently.

In the fourth embodiment shown in FIGS. 5A and 5B, FIGS. 1A and 1B to be attached to the outer walls of the protection cylinders 71c and 72c of the power supply terminals B1c and B2c. Numerals 91 and 92 each consisting of Arabic numerals indicating the inner diameter of the pipe connection portion of the electric welding pipe joints A1 and A2 shown in FIG.

That is, the electric welding pipe joint A shown in FIG.
The inner diameter H1 of the receptacle 11 of the electric welding pipe joint A1 is provided on the outer surface of the protection cylinder 71c of the power supply terminal B1c to be attached to the power supply terminal B1c.
75 of 75 mm is printed, and 150 of 150 mm, which is the inner diameter H2 of the receptacle 12 of the electric welding pipe joint A2, is printed on the outer surface of the protection cylinder 72c of the power supply terminal B2c to be attached to the electric welding pipe joint A2. Can be distinguished. In addition, 75, 150
May be printed instead of A and B, and an appropriate code may be printed so that the two can be distinguished. In addition,
In the fourth embodiment shown in FIG. 5, the first embodiment shown in FIGS.
As in the embodiment, the screwing portions 61 of the power supply terminals B1c and B2c are provided.
The outer diameters d1 and d2 of c and 62c are different from each other,
Electric welding pipe joints A1, A to which screw portions 61c, 62c are screwed.
The inner diameters D1, D2 of the two threaded portions may be different from each other in correspondence with the outer diameters d1, d2.

Also, in the fourth embodiment, as in the second embodiment shown in FIG. 3, the coating 81 on the electric connection end 51c of the power supply terminal B1c and the coating on the electric connection end 52c of the power supply terminal B2c. It may be colored in a different color from 82.

[0023]

[Effect of the Invention] In the combination of the electric welding pipe joint and the power supply terminal according to the present invention, since it is configured as described above, the power supply terminal to be attached to the pipe joint having a specific inner diameter can be easily visually recognized. There is no risk of poor welding or resin degradation due to misuse of the power supply terminal at the construction site.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views of an electric welding pipe joint of the present invention, and FIGS. 1C and 1D are cross-sectional views of a first embodiment of a power supply terminal of the present invention.

FIG. 2 is a sectional view showing a use state of FIG. 1;

FIG. 3 is a cross-sectional view of a power supply terminal according to a second embodiment of the present invention;

FIG. 4 is a side view of a third embodiment of the power supply terminal of the present invention.

FIG. 5 is a side view of a power supply terminal according to a fourth embodiment of the present invention.

[Explanation of symbols]

 A1, A2 Electric welded pipe joints B1, B2 Power supply terminal D1, D2 Power supply terminal inner diameter of screwed part H1, H2 inner diameter of pipe connection part d1, d2 outer diameter of screwed part 11, 12 pipe connection part 51, 52 Electrical connection Part 61, 62 Screwed part 71, 72 Protective cylinder 81, 82 Coating film 91, 92 Code

Claims (4)

(57) [Scope of request for utility model registration] In a combination of a plurality of electric welded pipe joints having different inner diameters of pipe connection portions and a plurality of types of power supply terminals,
The outer diameters of the screwed portions of the plurality of types of power supply terminals have different outer diameters in accordance with the inner diameters of the pipe connection portions of the electric welding pipe joint. And a power supply terminal. 2. A combination of a plurality of electric welding pipe joints having different inner diameters of pipe connection portions and a plurality of types of power supply terminals.
Electrical connection of a plurality of types of power supply terminals are differently colored according to the pipe connecting portion inner diameter of the electric welding pipe joint, electrical
The screwed part of the power supply terminal is screwed to the screwed part of the power supply terminal of the welded joint.
A combination of an electric welding pipe joint and a power supply terminal, characterized by being made possible . 3. A combination of a plurality of electric welding pipe joints having different inner diameters of pipe connection portions and a plurality of types of power supply terminals.
A protection cylinder is provided at an electrical connection part of a plurality of types of power supply terminals, and an outer shape of the protection cylinder has a different shape according to an inner diameter of a pipe connection part of the electric welding pipe joint.
The screwing part of the power supply terminal can be screwed into the child screwing part.
The combination of an electric welding pipe joint and the feed terminals, characterized in that is. 4. A combination of a plurality of electric welding pipe joints having different inner diameters of pipe connection portions and a plurality of types of power supply terminals.
Protecting cylinder is provided in the electrical connection of a plurality of types of power supply terminals, code corresponding to the tube connecting portion inner diameter of the electric welding pipe joint in the outer peripheral wall of the protective tube has been printed, the feeding end of the electric welding pipe joint
The screwing part of the power supply terminal can be screwed into the child screwing part.
The combination of an electric welding pipe joint and the feed terminals, characterized in that is.